Replace Environment variable with bash

Question

export const environment = {
  production: true,
  firebase: {
    apiKey: "APIKEY",
    authDomain: "AUTHDOMAIN",
    databaseURL: "DATABASEURL",
    projectId: "PROJECTID",
    storageBucket: "STORAGEBUCKET",
    messagingSenderId: "MESSAGINGSENDERID"
  },
  functionURL:"FUNCTIONSURL",

};

I have this type of file now I want to replace all variables (APIKEY, AUTHDOMAIN,..) using bash, please provide some generic solution!

sed  -i 's/($APIKEY)/('"$Master_APIKEY"')/g'

Already use for every variable in file.

Not clear, could you please mention more details? Like which file you want to edit? from where variable values should be picked up? — RavinderSingh13
– RavinderSingh13, Commented Aug 18, 2018 at 6:12
how is python related in this question? seems like javascript to me — Arghya Saha
– Arghya Saha, Commented Aug 18, 2018 at 6:13
@RavinderSingh13 file already given and variable value should be anything — soheshdoshi
– soheshdoshi, Commented Aug 18, 2018 at 6:20
@soheshdoshi if you know what you are replacing exactly then why not just do a sed "s/$APIKEY/$Master\_$APIKEY" — Inder
– Inder, Commented Aug 18, 2018 at 6:57
This uses sed, which has nothing to do with bash. Do you require bash code to do this? — cdarke
– cdarke, Commented Aug 18, 2018 at 7:06

builder-7000 · Accepted Answer · 2018-08-20 05:19:41Z

2

To prepend every variable with the string $Master_ use:

sed 's/\(.*: "\)\(.*\)"/\1$Master_\2"/g' inputfile

this command works like this:

$.*: "$: match everything until the string : " and capture in group 1
$.*$": match everything before the last " and capture in group 2
\1$Master_\2": replace with contents of group 1, followed by $Master_ and contents of group 2.

output:

export const environment = {                                                
  production: true,                                                         
  firebase: {                                                               
    apiKey: "$Master_APIKEY",                                               
    authDomain: "$Master_AUTHDOMAIN",                                       
    databaseURL: "$Master_DATABASEURL",                                     
    projectId: "$Master_PROJECTID",                                         
    storageBucket: "$Master_STORAGEBUCKET",                                 
    messagingSenderId: "$Master_MESSAGINGSENDERID"                          
  },                                                                        
  functionURL:"FUNCTIONSURL",                                               

};

you can include the -i.bak flag to replace the original file and make a backup file.

edited Aug 20, 2018 at 5:19

answered Aug 18, 2018 at 6:39

builder-7000

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2 Comments

soheshdoshi Over a year ago

what about FUNCTIONSURL?

builder-7000 Over a year ago

Wif you want to replace FUNCTIONSURL too then replace $.*: "$ with $.*: *"$ in the regex in order to match zero or more spaces after the colon.

tamara · Accepted Answer · 2018-08-18 08:07:27Z

2

Here is an example for what you are trying to acheive:

P.S. you don't need to cat and all, you can directly use sed -i on the file, this is just to demonstrate a single line code where we are inserting a variable on the given pattern:

a=REPLACEMENT ;cat inputfile | sed "s/\"\(.*\)\"/\""$a"_\1\"/g"

the output from the input file provided by you :

export const environment = {
  production: true,
  firebase: {
    apiKey: "REPLACEMENT_APIKEY",
    authDomain: "REPLACEMENT_AUTHDOMAIN",
    databaseURL: "REPLACEMENT_DATABASEURL",
    projectId: "REPLACEMENT_PROJECTID",
    storageBucket: "REPLACEMENT_STORAGEBUCKET",
    messagingSenderId: "REPLACEMENT_MESSAGINGSENDERID"
  },
  functionURL:"REPLACEMENT_FUNCTIONSURL",

};

edited Aug 18, 2018 at 8:07

tamara

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answered Aug 18, 2018 at 7:23

Inder

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2 Comments

soheshdoshi Over a year ago

It's give output like apikey : "REPLACEMENT_xyzv" time for replacing placeholder with environment variable

Inder Over a year ago

@sheshdoshi can u please share more details about the variable and your implementation??

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